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<head>
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  <title>Document</title>
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<body>
  <script>
    //  TODO:原生js中的数据代理
    //  数据代理:通过一个对象(obj1)代理对另一个对象(obj1) 中属性(b属性) 的操作(读/写)
    let obj = {a:1}; 
    let obj1 = {b:2}; 
    Object.defineProperty(obj1,'b',{
      get(){
        return obj1.b;
      },
      set(val){
        obj1.b = val;
      }
    });
    obj.b = 3;
    console.log(obj1.b);
  </script>
</body>
</html>